Can't Use The Microwave, Toaster, Coffeemaker, Arc Welder?

Hey now, I have a 1500 watt "Power Jack" PSW inverter that I probably bought from the same seller a couple years ago and it works quite well. I remember the hot babe modeling it was a great selling point. Actually, the inverter does fault out when battery voltage is above 14.8 V, and also of I try running it when it's much below freezing temp, but other than that it was a bargain for PSW.